Library of Congress

• Search the LibrarySearch everything the Library of Congress publishes on loc.gov: photographs, maps, newspapers, manuscripts, books, recordings, films and web archives, alongside its own web pages and legislation. Returns one flat row per item with its title, date, contributors, subjects, rights and image URLs.
• Search by formatSearch one kind of material - photos, maps, newspapers, manuscripts, books, audio, film, notated music, legislation or web archives. Leave the query empty to browse the whole format, which is what the sort and date range are for.
• List digital collectionsList the Library's digital collections - curated groups of items such as Civil War Maps or Baseball Cards. Each row carries the slug the collection is addressed by, so this is the step that feeds Search a collection.
• Search a collectionSearch inside one digital collection, or browse it with no query. Takes the collection's slug, such as civil-war-maps - a full collection URL is accepted too.
• Get an itemFetch one item's full catalogue record, the digitised files attached to it, and ready-made APA, Chicago and MLA citations. Takes an item id such as 2014717546, a loc.gov item URL, or an lccn.loc.gov permalink.
• Get a resourceFetch one resource of a multi-part item - a single newspaper issue, one atlas, one reel - together with its segments: the pages of that issue or the maps in that atlas.
• Get search facetsList the filter values a search can be narrowed by, with a count for each. The Library's own advice for a large result set is to facet rather than page through it, and every value comes back ready to drop into a search's Filters field.

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